
ICS1892, Rev. D, 2/26/01
February 26, 2001
122
Chapter 10
DC and AC Operating Conditions
ICS1892 Data Sheet
2000-2001, Integrated Circuit Systems, Inc.
All rights reserved.
10.4
DC Operating Characteristics
This section lists the DC operating characteristics for the ICS1892.
10.4.1
DC Operating Characteristics for Supply Current
Table 10-4
lists the DC operating characteristics for the supply current to the ICS1892.
Note:
All V
DD
measurements are taken with respect to V
SS
(which equals 0 V).
These supply current parameters are measured through V
DD
pins to the ICS1892. The supply current
parameters exclude external transformer currents.
10.4.2
DC Operating Characteristics for TTL Inputs and Outputs
Table 10-5
lists the DC operating characteristics of the ICS1892 TTL inputs and outputs.
Note:
All V
DD
measurements are taken with respect to V
SS
(which equals 0 V).
10.4.3
DC Operating Characteristics for REF_IN
Table 10-6
lists the DC characteristics for the REF_IN pin.
Note:
The REF_IN input switch point is 50% of V
DD
.
Table 10-4.
DC Operating Characteristics for Supply Current
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
Supply Current
I
DD
I
DD
I
DD
I
DD
I
DD
100Base-TX Mode
V
DD
= 5.25 V
V
DD
= 5.25 V
V
DD
= 5.25 V
V
DD
= 5.25 V
V
DD
= 5.25 V
–
162
180
mA
Supply Current
10Base-T Mode
–
133
147
mA
Supply Current
Auto-Negotiation Mode
–
162
180
mA
Supply Current
Power-Down Mode
–
18
20
mA
Supply Current
Reset
–
39
43
mA
Table 10-5.
DC Operating Characteristics for TTL Inputs and Outputs
Parameter
Symbol
Conditions
Min.
Max.
Units
TTL Input High Voltage
V
IH
V
IL
V
OH
V
OL
V
OH
V
DD
= 5.25 V
V
DD
= 5.25 V
V
DD
= 4.75 V
V
DD
= 4.75 V
V
DD
= 4.75 V
–
2.0
–
V
TTL Input Low Voltage
–
–
0.8
V
TTL Output High Voltage
I
OH
= –4 mA
I
OL
= +4 mA
I
OH
= –4 mA
2.4
–
V
TTL Output Low Voltage
–
0.4
V
TTL Driving CMOS,
Output High Voltage
3.68
–
V
TTL Driving CMOS,
Output Low Voltage
V
OL
V
DD
= 4.75 V
I
OL
= +4 mA
–
0.4
V
Table 10-6.
DC Operating Characteristics for REF_IN
Parameter
Symbol
Test Conditions
Min.
Max.
Units
Input High Voltage
V
IH
V
IL
V
DD
= 5.25 V
V
DD
= 5.25 V
V
SS
= 0 V
V
SS
= 0 V
3.5
–
V
Input Low Voltage
–
1.5
V